Rh-3Fh Series: Inspecting/Adjusting The J3 Axis Timing Belt - Mitsubishi Electric RH-3FH Series Instruction Manual

(2) RH-3FH series: Inspecting/Adjusting the J3 axis timing belt

The section related to J3 axis timing belt of RH-3FH series and adjustment is shown in
the image which removed the No.2 arm cover.
<2> J3 axis motor fixing screw
loosen lightly
<1>Tension adjustment screw
Loosen the nut, adjust by
screw
<5> J3 timing pulley A
Fig.5-11 ： Inspecting/Adjusting the J3 axis timing belt
Inspection and adjustment procedure of the timing belt of J3 axis are shown below.
1) Confirm that the power supply of the controller is OFF.
2) Refer to Page 81 "Fig. 5-4: Installing/removing the
3) Visually confirm that the symptoms indicated
the <4> timing belt.
4) Lightly press the center of the belt, and confirm that the value of belt slack is in
tension". Or measure the tension of the belt with tension meters, and confirm that the value is in the range
of standard tension shown in
When adjustment is necessary, continue to follow the procedure shown below.
When adjustment is not necessary, install the No.2 arm cover U as before and finish the inspection.
5) Lightly loosen J3 motor installation screws <2> (Be careful not to overly loosen the screws.).
6) The nut which is fixing tension adjustment screw <1> is loosened, turn tension adjustment screw <1>, and
adjust the tension of timing belt <4>.
When the screw is turned to the right, the belt will be stretched, and when turned to the left, will loosen.
Adjust tension to the above-mentioned value.
Note) Be careful, if the belt is removed from pulley <5> <6>, or the mesh of belt and pulley <5> <6> is
shifted by loosening the screw too much, the origin will deviate. If the position deviated, reset the
origin. (Refer to
7) After adjustment, fasten securely the two J3 axial motor fixing screws <2>, and the nut of tension
adjustment screw <1>. Improper tightening may cause the belt to loosen with vibration.
8) Install No.2 arm cover U securely as before and finish adjustment.
This completes adjustment of the J3 axis timing belt.
Don't remove the timing
belt.
Page 98 "Fig. 5-14: Belt
Page 110, "5.6 Resetting the
<3> J3 axis motor
<2> J3 axis motor fixing screw
loosen lightly
Push
<4> Timing belt
cover", and remove the No.2 arm cover U.
in"(1)Timing belt replacement period"
tension".
origin")
Maintenance and inspection procedures 5-88
5 Maintenance and Inspection
Fig. 5-11. The picture is
<6> J3 timing pulley B
Don't remove the timing
belt.
have not occurred with
Page 98 "Fig. 5-14: Belt